/*
 *
 * Copyright (c) 2023 - future
 * @author fzh
 * @email e_341877120_mail@163.com
 * @link https://mvnrepository.com/search?q=io.github.xrfzh.cn
 *
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package cn.xrfzh.generator.utils;

import cn.xrfzh.generator.config.GenConfigurationProperties;
import cn.xrfzh.generator.entity.ColumnEntity;
import cn.xrfzh.generator.entity.TableEntity;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 代码生成器工具类
 */
@Component
public class GenUtil2 {

	@Resource
	private GenConfigurationProperties genConfigurationProperties;

	public List<String> getTemplates() {
		List<String> templates = new ArrayList<>();
		templates.add("template/Pojo.java.vm");
		templates.add("template/Mapper.xml.vm");
		templates.add("template/Service.java.vm");
		templates.add("template/ServiceImpl.java.vm");
		templates.add("template/Controller.java.vm");
		templates.add("template/Mapper.java.vm");
		templates.add("template/Dto.java.vm");
		templates.add("template/list.vue.vm");
		templates.add("template/api.js.vm");
		return templates;
	}

	/**
	 * 生成代码
	 */
	public void generatorCode(Map<String, String> table, List<Map<String, String>> columns, ZipOutputStream zip) {
		// 配置信息
		Configuration config = getConfig();
		boolean hasBigDecimal = false;
		boolean hasList = false;
		// 表信息
		TableEntity tableEntity = new TableEntity();
		tableEntity.setTableName(table.get("tableName"));
		tableEntity.setComments(table.get("tableComment"));
		// 表名转换成Java类名
		String className = tableToJava(tableEntity.getTableName(), genConfigurationProperties.getTablePrefix());
		tableEntity.setClassName(className);
		tableEntity.setClassname(StringUtils.uncapitalize(className));
		// 列信息
		List<ColumnEntity> columsList = new ArrayList<>();
		for (Map<String, String> column : columns) {
			ColumnEntity columnEntity = new ColumnEntity();
			columnEntity.setColumnName(column.get("columnName"));
			columnEntity.setDataType(column.get("dataType"));
			columnEntity.setComments(column.get("columnComment"));
			columnEntity.setExtra(column.get("extra"));
			// 列名转换成Java属性名
			String attrName = columnToJava(columnEntity.getColumnName());
			columnEntity.setAttrName(attrName);
			columnEntity.setAttrname(StringUtils.uncapitalize(attrName));
			// 列的数据类型，转换成Java类型
			String attrType = config.getString(columnEntity.getDataType(), columnToJava(columnEntity.getDataType()));
			columnEntity.setAttrType(attrType);
			if (!hasBigDecimal && attrType.equals("BigDecimal")) {
				hasBigDecimal = true;
			}
			if (!hasList && "array".equals(columnEntity.getExtra())) {
				hasList = true;
			}
			// 是否主键
			if ("PRI".equalsIgnoreCase(column.get("columnKey")) && tableEntity.getPk() == null) {
				tableEntity.setPk(columnEntity);
			}
			columsList.add(columnEntity);
		}
		tableEntity.setColumns(columsList);
		// 没主键，则第一个字段为主键
		if (tableEntity.getPk() == null) {
			tableEntity.setPk(tableEntity.getColumns().get(0));
		}
		// 设置velocity资源加载器
		Properties prop = new Properties();
		prop.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
		Velocity.init(prop);
		String mainPath = genConfigurationProperties.getMainPath();
		mainPath = StringUtils.isBlank(mainPath) ? "com.xr" : mainPath;
		// 封装模板数据
		Map<String, Object> map = new HashMap<>();
		map.put("tableName", tableEntity.getTableName());
		map.put("comments", tableEntity.getComments());
		map.put("pk", tableEntity.getPk());
		map.put("className", tableEntity.getClassName());
		map.put("classname", tableEntity.getClassname());
		map.put("pathName", tableEntity.getClassname().toLowerCase());
		map.put("columns", tableEntity.getColumns());
		map.put("hasBigDecimal", hasBigDecimal);
		map.put("hasList", hasList);
		map.put("mainPath", mainPath);
		map.put("pkg", genConfigurationProperties.getPkg());
		map.put("moduleName", genConfigurationProperties.getModuleName());
		map.put("author", genConfigurationProperties.getAuthor());
		map.put("email", genConfigurationProperties.getEmail());
		map.put("datetime", DateUtil.format(new Date(), DateUtil.DATE_TIME_PATTERN));
		VelocityContext context = new VelocityContext(map);
		// 获取模板列表
		List<String> templates = getTemplates();
		for (String template : templates) {
			// 渲染模板
			StringWriter sw = new StringWriter();
			Template tpl = Velocity.getTemplate(template, "UTF-8");
			tpl.merge(context, sw);
			try {
				// 添加到zip
				zip.putNextEntry(new ZipEntry(Objects.requireNonNull(getFileName(template, tableEntity.getClassName(),
						genConfigurationProperties.getPkg(), genConfigurationProperties.getModuleName()))));
				IOUtils.write(sw.toString(), zip, "UTF-8");
				IOUtils.closeQuietly(sw);
				zip.closeEntry();
			}
			catch (IOException e) {
				throw new RRException("渲染模板失败，表名：" + tableEntity.getTableName(), e);
			}
		}
	}

	/**
	 * 列名转换成Java属性名
	 */
	public String columnToJava(String columnName) {
		return WordUtils.capitalizeFully(columnName, new char[] { '_' }).replace("_", "");
	}

	/**
	 * 表名转换成Java类名
	 */
	public String tableToJava(String tableName, String[] tablePrefixArray) {
		if (null != tablePrefixArray && tablePrefixArray.length > 0) {
			for (String tablePrefix : tablePrefixArray) {
				if (tableName.startsWith(tablePrefix)) {
					tableName = tableName.replaceFirst(tablePrefix, "");
				}
			}
		}
		return columnToJava(tableName);
	}

	/**
	 * 获取配置信息
	 */
	public Configuration getConfig() {
		try {
			return new PropertiesConfiguration("generator.properties");
		}
		catch (ConfigurationException e) {
			throw new RRException("获取配置文件失败！", e);
		}
	}

	/**
	 * 获取文件名
	 */
	public String getFileName(String template, String className, String packageName, String moduleName) {
		String packagePath = "main" + File.separator + "java" + File.separator;
		if (StringUtils.isNotBlank(packageName)) {
			packagePath += packageName.replace(".", File.separator) + File.separator + moduleName + File.separator;
		}
		if (template.contains("Pojo.java.vm")) {
			return packagePath + "pojo" + File.separator + className + ".java";
		}
		if (template.contains("Dto.java.vm")) {
			return packagePath + "dto" + File.separator + className + "Dto.java";
		}
		if (template.contains("Mapper.java.vm")) {
			return packagePath + "mapper" + File.separator + className + "Mapper.java";
		}
		if (template.contains("Service.java.vm")) {
			return packagePath + "service" + File.separator + "I" + className + "Service.java";
		}
		if (template.contains("ServiceImpl.java.vm")) {
			return packagePath + "service" + File.separator + "impl" + File.separator + className + "ServiceImpl.java";
		}
		if (template.contains("Controller.java.vm")) {
			return packagePath + "controller" + File.separator + className + "Controller.java";
		}
		if (template.contains("Mapper.xml.vm")) {
			return "main" + File.separator + "resources" + File.separator + "mapper" + File.separator + className
					+ "Mapper.xml";
		}
		if (template.contains("list.vue.vm")) {
			return "main" + File.separator + "resources" + File.separator + "views" + File.separator
					+ className.toLowerCase() + "List.vue";
		}
		if (template.contains("api.js.vm")) {
			return "main" + File.separator + "resources" + File.separator + "apis" + File.separator
					+ className.toLowerCase() + "Api.js";
		}
		return null;
	}

}
